Improvement in windlasses



Z Shees-Sheet 1'. D. N. B. COFFIN, Jr.

- WINDLASS. 'No.17 Z,55'6. Patented Jan. 25, 1876.

Wines 6 as. Jmrenfo'r. Qua /5a /L Z Sheets-Sheet 12.

D.N.B.C0FFIN, J1-. WINDLASS.

No.172.556. Patented Jan. 25,1876.

WYWSSS.

JWW @z% Z/WWW UNI ED STATES PA'rEn' Orro n DAVID N. B. GOFFIN, JR, OF NEWTON, MASSACHUSETTS.

IMPROVEMENT lN WINDLASSES.

Specification forming part of Letters Patent No. 172,556, dated January 25, 1876; application filed February 27, 1875.

To all whom it may concern.-

Be it known that. I, DAVID N. B. Comm, J r., resident of the city of Newton, county of Middlesex and State of Massachusetts, have invented Improvements in Winches or Windlasses, of which the following is a specifioa specification are drawings, of which Figure l is a perspective viewof a portable winch or Windlass, in which my improvements are illustrated. Fig. 2 is a similar enlarged View of a portion of the same machine. Fig. 3 is a view, in elevation, of one of the end-sections of the frame-work as constructed before setting up in the full machine. Fig. 4 shows an end view of the combined friction and gear wheel, the friction expansion-band, combined hand and foot lever, &c.

The essentials in the improved construction of the end sections of the frame, as illustrated in Figs. 1 and 3, and whereby greater strength, lightness, and elasticity are obtained, consist in the two Wrought-iron or steel rods, to b, which may be made solid or hollow, but are arranged to stand in inclined positions converging upward toward or near to the bearings 0 of the shaft. These wrought rods may be made of round, square, T-shaped, or polygon-sectioned iron or steel, and are secured in position and relation to each other by casting the necessary east-iron bearings and attachments for the shafts and other appendages upon them in the form of connections and braces, at once holding and giving them the necessary support, as shown, the upper cast connection forming a bearing for shaft m, attachments for connecting rod or piece 01, and otherappendages, the lower east connection forming suitable feet for bolting down to any desirable foundation or resting-place, a bearin g for shaft f, attachments forthe connecting pieces or rods g, the friction-band u, and any other desired appendages and suitable braces for the rods a 12, substantially as shown. These end sections of the frame may be made with the wrought cross-rod 70 cast in, as shown in Fig. 3, or it may be dispensed with, as in Fig. 1, according to the conditions of strength,

lightness, and elasticity desired. A barrel, i,

is mounted on the shaft f for winding or working a rope or chain, and on the same shaft is mounted the wheel j, which serves the double purpose of gear to rotate the shaft or barrel i3, and also as a friction-wheel to retard and control their movements in lowering away, &c. This wheel j is provided externally with gearteeth, playing into gearl on the driving-shaft m, by which it is driven, and has also an internal periphery, to which is fitted and applied the expansion friction-band a. One end of the friction-band u is made fast to a stationary point or a"'part of the frameythereby being held stationary, while the other end is jointed to the short end of the lever 0.. The lever o is provided with a handle, 19, and a treadle, g, by either of which, or both together, it can be operated to expand the band it in the wheelj, and so control its movements. Whenever it is required to retard or stop the movement of the wheel j and barrel t, it is done by an outward pressure of the hand at p, or a downward pressure of the foot at q, or both, which. causes a forcible expansion of the band u out ward into frictional contact with the internal frictional wheel j, thereby to control or stop its rotation at the pleasure of the operator. The strap or band to may be of spriiigsteel or other metal; if of springmetal, and formed to a smaller curve than the internal frictionsurface of the Wheel, it will relieve itself from frictional contact automatically whenever it is not forcibly expanded; but it will answer a good purpose made of ordinary iron, in which case, if the contractile spring-force is not sufficient to relieve itself from frictional contact, the opposite movement of the lever will relieve it. The gear 1 is disengaged from the gearj by sliding it longitudinally upon its shaft and spline. A hand-rim is provided and attached to it for the purpose, and a swinging arm or dog from rod 01 holdsit out or in gear, as desired. The usual heads, ratchets, and pawls are provided for the, upper shaft, and

may be added to the lower one, if desired, in other respects than those described and claimed below.

; The winch or Windlass does not differ materially from others now in use.

I claim- 1. The band u, made expandable by exterior force, in combination with the internal frictional wheel j, and the barrel or shaft of the winch or Windlass, substantially as described.

2. The lever p 0, provided with the foottreadle q, in combination with the frictionband and friction-wheel of a Windlass.

directly upon the two upwardly-converging rods of wrought-iron or steel, a 11, substantially as described.

DAVID N]. B. OOFFIN, JR.

Witnesses:

LYSANDER BURNETT, FRANK K. ROGERS. 

